Re: [WIP] Effective storage of duplicates in B-tree index.

From: Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com>
To: Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Anastasia Lubennikova <a(dot)lubennikova(at)postgrespro(dot)ru>, David Steele <david(at)pgmasters(dot)net>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [WIP] Effective storage of duplicates in B-tree index.
Date: 2016-03-25 00:22:49
Message-ID: 56F484D9.1060007@BlueTreble.com
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On 3/24/16 10:21 AM, Alexander Korotkov wrote:
> 1) It's a great feature many users dream about.

Doesn't matter if it starts eating their data...

> 2) Patch is not very big.
> 3) Patch doesn't introduce significant infrastructural changes. It just
> change some well-isolated placed.

It doesn't really matter how big the patch is, it's a question of "What
did the patch fail to consider?". With something as complicated as the
btree code, there's ample opportunities for missing things. (And FWIW,
I'd argue that a 51kB patch is certainly not small, and a patch that is
doing things in critical sections isn't terribly isolated).

I do think this will be a great addition, but it's just too late to be
adding this to 9.6.

(BTW, I'm getting bounces from a(dot)lebedev(at)postgrespro(dot)ru, as well as
postmaster(at)(dot) I emailed info(at)postgrespro(dot)ru about this but never heard back.)
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com

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